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Stock-Based Compensation - Schedule of Share-Based Compensation, Restricted Stock Award Activity (Detail) (Restricted Stock [Member], USD $)
3 Months Ended
Nov. 30, 2012
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Nonvested at August 31, 2011 61,716
Shares, Granted   
Shares, Vested (29,865)
Shares, Cancelled   
Shares, Nonvested at November 30, 2012 31,851
Weighted-Average Grant-Date Fair Value, Beginning balance (in USD per share) $ 5.94
Weighted-Average Grant-Date Fair Value, Granted (in USD per share)   
Weighted-Average Grant-Date Fair Value, Vested (in USD per share) $ 6.25
Weighted-Average Grant-Date Fair Value, Cancelled (in USD per share)   
Weighted-Average Grant-Date Fair Value, Ending balance (in USD per share) $ 5.65